He's got 240 innings spread over 5 seasons in the majors, as a middle reliever. There's no reason why somebody who follows baseball to know who he is. The vast majority of those innings have come in the past 3 years, and he's been very good. You probably wouldn't know who he is if you're a casual fan, but if you big enough into baseball to hang around message boards a lot you'd know who he is. Especially if you're a fan of an NL team. He plays on the most inconsequential team in the league. I've heard of him because he was a Yankee, but I had no idea who he was playing for now. It's crazy to suggest somebody who follows baseaball has to know who he is.